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Acadia National Park Managers’ Report
A citizen science early-detection summary
Welcome to the weekly early detection report of observations submitted by iNaturalist and eBird users. These are all observations submitted over the past week for species that Acadia National Park managers and partners have identified as being of conservation interest. These data for this report comes from two of the largest open source citizen science projects: iNaturalist and eBird. The records included in this report include both casual and research grade observations, so erroneous identifications are possible. Users should double check the identification of species to ensure they are correct.
25 August 2025 - 31 August 2025

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Invasive Species

A Hemlock tree infested with Hemlock Woolly Adelgid
© Jesse Wheeler
Scientific Name Common Name Date Observed Link
Litylenchus crenatae beech leaf disease 2025-08-25 view observation
Galeopsis bifida bifid hemp-nettle 2025-08-26 view observation
Galeopsis bifida bifid hemp-nettle 2025-08-29 view observation
Solanum dulcamara bittersweet nightshade 2025-08-27 view observation
Epipactis helleborine broad-leaved helleborine 2025-08-25 view observation
Cirsium vulgare bull thistle 2025-08-28 view observation
Reynoutria japonica japanese knotweed 2025-08-28 view observation
Reynoutria japonica japanese knotweed 2025-08-30 view observation
Rosa rugosa rugosa rose 2025-08-27 view observation
Rosa rugosa rugosa rose 2025-08-29 view observation

Threatened & Endangered Species

Two Red Knots in flight
© Fyn Kynd
Scientific Name Common Name Listing Date Observed Link
Falco peregrinus peregrine falcon state endangered 2025-08-30 view observation
Falco peregrinus peregrine falcon state endangered 2025-08-31 view observation

Rare Species

A flowering Nodding Trillium
© Andy Fyon
Scientific Name Common Name Date Observed Link
Lonicera canadensis american fly-honeysuckle 2025-08-28 view observation
Teucrium canadense american germander 2025-08-30 view observation
Solidago flexicaulis broad-leaved goldenrod 2025-08-28 view observation
Typha latifolia broadleaf cattail 2025-08-31 view observation
Corema conradii broom crowberry 2025-08-25 view observation
Corema conradii broom crowberry 2025-08-26 view observation
Tsuga canadensis eastern hemlock 2025-08-28 view observation
Toxicodendron radicans eastern poison ivy 2025-08-25 view observation
Toxicodendron radicans eastern poison ivy 2025-08-27 view observation
Euthamia graminifolia flat-topped goldenrod 2025-08-27 view observation
Fraxinus pennsylvanica green ash 2025-08-27 view observation
Danaus plexippus monarch 2025-08-28 view observation
Viburnum recognitum northern arrowwood 2025-08-27 view observation
Rhodiola rosea roseroot 2025-08-29 view observation
Lysimachia maritima sea milkwort 2025-08-28 view observation
Lysimachia maritima sea milkwort 2025-08-28 view observation
Epigaea repens trailing arbutus 2025-08-28 view observation
Fraxinus americana white ash 2025-08-25 view observation
Chelone glabra white turtlehead 2025-08-27 view observation

Buffer Zone Species

© Kyle Lima
Scientific Name Common Name Date Observed Link
Litylenchus crenatae beech leaf disease 2025-08-25 view observation
Galeopsis bifida bifid hemp-nettle 2025-08-25 view observation
Galeopsis bifida bifid hemp-nettle 2025-08-26 view observation
Galeopsis bifida bifid hemp-nettle 2025-08-29 view observation
Solanum dulcamara bittersweet nightshade 2025-08-25 view observation
Solanum dulcamara bittersweet nightshade 2025-08-27 view observation
Epipactis helleborine broad-leaved helleborine 2025-08-25 view observation
Cirsium vulgare bull thistle 2025-08-28 view observation
Cirsium arvense creeping thistle 2025-08-28 view observation
Cirsium arvense creeping thistle 2025-08-30 view observation
Adelges tsugae hemlock woolly adelgid 2025-08-26 view observation
Adelges tsugae hemlock woolly adelgid 2025-08-27 view observation
Adelges tsugae hemlock woolly adelgid 2025-08-28 view observation
Impatiens glandulifera himalayan balsam 2025-08-30 view observation
Berberis thunbergii japanese barberry 2025-08-26 view observation
Berberis thunbergii japanese barberry 2025-08-30 view observation
Reynoutria japonica japanese knotweed 2025-08-28 view observation
Reynoutria japonica japanese knotweed 2025-08-30 view observation
Lupinus polyphyllus large-leaved lupine 2025-08-28 view observation
Lupinus polyphyllus large-leaved lupine 2025-08-31 view observation
Celastrus orbiculatus oriental bittersweet 2025-08-29 view observation
Celastrus orbiculatus oriental bittersweet 2025-08-29 view observation
Hylotelephium telephium orpine 2025-08-30 view observation
Lythrum salicaria purple loosestrife 2025-08-29 view observation
Rosa rugosa rugosa rose 2025-08-25 view observation
Rosa rugosa rugosa rose 2025-08-26 view observation
Rosa rugosa rugosa rose 2025-08-27 view observation
Rosa rugosa rugosa rose 2025-08-27 view observation
Rosa rugosa rugosa rose 2025-08-28 view observation
Rosa rugosa rugosa rose 2025-08-28 view observation
Rosa rugosa rugosa rose 2025-08-28 view observation
Rosa rugosa rugosa rose 2025-08-29 view observation

New Park Species

A something
© Kyle Lima

There were no new species to the park reported this week.

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